Locomotive water-tube boiler



Julie 10, 1930. M R 1,763,140

LOCOMOTIVE WATER TUBE BOILER Filed Sept. 20, 1928 ZSheets-Sheet 1 June10, 193 0. EMERSON 1,753,140

LOCOMOTIVE WATER TUBE BOILER Filed Sept. 20, 1928 2.Sheets-Sheet 2 /G. 5A? A? Patented June 10, 1930 GEORGE E. EMERSON, OF BALTIMORE, MARYLANDLOCOMOTIVE WATER-TUBE BOILER Application filed September 20, 1928.Serial No. 307,155.

In some water tube boilers there is an elbow connection between thebottom of the boiler shell and the front end of the fire box waterframe, through which water is furnished for the fire box tubes. Due tothe fact that the opening to the elbow is approximately 30" in front ofthe back flue sheet there is formed a pocket, or space, where thecirculation is relatively slow, so that there is a constantprecipitation of mud and other solid matter, which builds up around thelower fiues and in the bottom radius of the back flue sheet, and if notconstantly cleaned results in mud burning of the flue sheet.

The object of the present invention is to overcome this objection byturning up the front mud ring casting for a suitable distance to engagea flanged extension of the back tube sheet and a throat sheet attachedto the rear end of the boiler shell. 7

This connection eliminates two fiat flange connections used in previousdesigns, and at the same time eliminates the sediment pocket as thecirculation is directly from the end of the boiler'course into the-frontmud ring or water bar frame.

In the drawings: Figure 1 is a front elevation of the back flue sheetand front mudring casting embodying my invention.

Figure 2 is a detail sectional view on the line 22, Figure 1, looking inthedirection of the arrows. Figure 3 is a detail sectional view on the 3line 33, Figure 1.

Figure 4 is a front elevation of the'throat sheet.

Figure 5 is a bottom edge view of the back tube sheet.

Figure 6 is a top plan view of the throat sheet. Y 7

The reference number 7 designates the back tube sheet which is differentfrom the tube sheets heretofore employed in that it has at its bottom adownward extension or apron 8, the side edge portions of said extensionbeing flanged or bent to form flanges 9 which join the flue sheet withthe shell of the boiler, said flanges being on the outside of the shell.

The front mud ring 10 for a suitable distance at the center is turned upin the form of an extension 11 to engage the back tube sheet extension8, and the throat sheet 12 vihiih is attached to the rear end of theboiler s e1 The flat surface of the extension 8 affords a suitable spaceinto which to enter the arch tube, or tubes, when used, in the openings16. 15 designates other arch tubes.

The throat sheet 12 is shown detached in Figures .4 and 6 and isprovided with the flange 14 conforming to the contour of the boilershell, and with flanges 13 which lap the flanges 9 of the extension 8.Rivets, or threaded plugs, 15 secure the throat sheet 12, extension 11of the mud ring, and the extension 8 of the back tube sheet firmlytogether.

What I claim is:

1. In a water tube boiler, a back tube sheet having a downwardlydepending apron at its lower edge, a forwardly extending flange at eachside edge of saidapron, a front mud ring having an upwardly extendingtubular like extension approximately midway its ends, a throat sheethaving rearwardly extending flanges at its side edges adapted tounderlap the side flanges of the apron, said tube like extension of thesaid mud ring entirely surrounded by said throat sheet and tube sheetand secured thereto.

2. In a water tube boiler, a back tube sheet, a throat sheet, and afront mud ring provided with an upwardly extending tubular likeextension approximately midway between its ends, said tube sheet andthroat sheet having extensions conj ointly forming an enclosure aboutsaid tubular-like extension of the mud ring and secured thereto.

3. In a water tube boiler, a back tube sheet having an extension, a mudring having a tubular projection, and a throat sheet having anextension, the extensions of the tube sheet and throat sheet beingarranged to embrace the tubular projection of the mud ring and securedthereto.

4. In a water tube boiler, a back tube sheet having adownwardlydepending apronprovided with arch tube receiving openings,arch tubes fitted in said openings, a mud ring pro- 4 vided with atubular projection, and a throat sheet having an extension, the saidapron of the back tube sheet and the extension of the throat sheet beingarranged to embrace the tubular projection of the mud ring and securedthereto.

5. In a water tube boiler, a back tube sheet havin a downwardlydepending extension, a front mud ring having an upwardly extendingtubular-like projection approximately midway its ends, and a throatsheet having rearwardly extending flanges at its side edges, theextension of the back tube sheet and the flanges or" the throat sheetbeing arranged in lapped relation and forming an enclosure for thetubular projection of the mud ring.

6. In a water tube boiler, a back tube sheet, a throat sheet, and afront niud ring having a tubular projection, the back tube sheet and thethroat sheet having portions folded about said tubular projection of themud ring and arranged in lapping relation to provide an enclosure forand secured to said tubular projection.

7. In a water tube boiler, a back tube sheet having a downwardlydepending apron at its lower edge, a forwardly extending flange at eachside edge of said apron, a front niud ring having an upwardly extendingtubular-like projection approximately midway its ends, a throat sheethaving a flange conforming to the contour of the boiler shell andsecured thereto, and provided with other flanges, the

flanges of the back tube sheet apron and the second-named flanges of thethroat sheet being arranged to overlap and surround the tubular-likeprojection of the mud ring and secured thereto.

In testimony whereof I aflix my signature.

GEORGE H. EMERSON.

